Test 4 Notes.

Test 4 Notes. - Test 4 Myology- study of muscles 45% of...

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Test 4 Myology- study of muscles 45% of total body mass is muscular tissue Generate most of the work done by the body Overview - 3 types o Skeletal Produces bodily movements Striated and voluntary o Cardiac Striated and branched (muscle is Y- shaped), involuntary Autorhythmic o Smooth Found in the walls of blood vessels and muscles of the digestive tract, controlled by the Autonomic nervous system Unstriated and involuntary - Depends on anatomy, location, and how they are controlled (voluntary/involuntary) - Muscle tissue functions Functions - Body movements o Movements, food digestion - Body stability o Posture, locking our knees, stabilizing joints - Storing and moving substances o Move blood, lymph, urine - Heat
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o Shivers, preserve energy Properties of Muscular Tissue - Electrical excitability o Neurons too o How we respond to a stimulus o First respone - Contractility o How muscles contract in response to a stimuli - Extensibility o Tensile strength o Can stretch without being damaged (most of the time) - Elasticity o Can come back to its original shape - Conductivity o Ability to propagate a signal through a muscle o Carrying out response to stimuli Skeletal Muscle Organization - Belly o Largest, thickest part - Tendons o Connective tissue that connect muscles to bones o Parallel rows of collagen fibers o Extension of three connective tissue layers that surround layers of skeletal muscle Epimysium Surrounds the belly of the muscle Perimysium
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Surrounds a fascicle (bundle of muscle fibers) Endomysium Surrounds a muscle fiber (called a myofibril) - Muscle fibers o Multinucleated You are born with as many muscles fibers as you will ever have Work out so you can increase the size of your muscle fibers o Atrophy To get smaller Reversible o Hypertrophy To get larger Denervation (muscle signals are cut off) Irreversible o Sarcolemma (“lemma” means membrane) Plasma membrane of the muscle fiber o Sarcoplasm Cytoplasm of the muscle fiber o Myofiliments (dots within myofibrils) -> Myofibrils -> Myofibers (largest)- actual muscle cell o T Tubule Triad- made of a T tubule and 2 terminal (end) cisterns Signal is sent down through the Sarcolemma into the Sarcoplasm and the T tubule transfers the signal into the muscle fiber, initiating the release of calcium Contain interstitial fluid - Myofibrils
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o Made of thick and thin filaments which are made of protein o The pattern of overlap of thick and thin filaments consists of zones and bands which cause the striated appearance of skeletal muscle Dark band is the A band (anistrophic)- everywhere you have thick filaments. Light band is the I band (isotrophic)- where there aren’t thick filaments. -
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Test 4 Notes. - Test 4 Myology- study of muscles 45% of...

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